Alexa is saying “Sorry, I did not understand the request.” What do I do?

If the request you made is possible, try speaking to Alexa slowly and clearly in a room with no background noise. You can check if Alexa is hearing you properly through the Alexa mobile app, and going to Settings > History to see how Alexa has recorded what you’ve said. If it isn’t, please complete the Voice Training found on the Alexa app.